{"id":"CVE-2026-58644","aliases":["EUVD-2026-43779","GHSA-q6cq-5qpf-q237"],"status":"published","title":"Microsoft SharePoint Remote Code Execution Vulnerability","description":"Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.15873,"percentile":0.96927,"model":"v2026.06.15"},"facts":{"in_kev":true,"known_exploited":true,"public_exploit":false,"fix_available":false},"cwes":["CWE-502"],"published":"2026-07-14T17:05:37Z","modified":"2026-11-01T17:33:12Z","kev":{"date_added":"2026-07-16","due_date":"2026-07-19","required_action":"Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.","known_ransomware_use":"Unknown"},"exploitation":[{"source":"euvd","since":"2026-07-16"},{"source":"kev","since":"2026-07-16"}],"exploits":[{"source":"nuclei","id":"CVE-2026-58644","title":"Microsoft SharePoint Server - WS-Federation BinaryFormatter Deserialization RCE","type":"detection template","url":"https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-58644.yaml"}],"products":[{"vendor":"microsoft","product":"microsoft sharepoint enterprise server 2016"},{"vendor":"microsoft","product":"microsoft sharepoint server 2019"},{"vendor":"microsoft","product":"microsoft sharepoint server subscription edition"},{"vendor":"microsoft","product":"sharepoint"},{"vendor":"microsoft","product":"sharepoint_server"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58644","tags":["vendor-advisory","patch","Patch","Vendor Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-58644","tags":["government-resource","US Government Resource"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-58644"},{"url":"https://github.com/advisories/GHSA-q6cq-5qpf-q237"}],"sources":{"cve":[{"id":"CVE-2026-58644","title":"Microsoft SharePoint Remote Code Execution Vulnerability","description":"Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.","status":"published","published":"2026-07-14T17:05:37.431Z","modified":"2026-11-10T22:36:11.083Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C","level":"critical","assessor":"cna"}],"cwes":["CWE-502"],"updated_at":"2026-11-10T23:49:29.755102Z"}],"euvd":[{"id":"EUVD-2026-43779","description":"Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.","status":"published","published":"2026-07-14T17:05:37Z","modified":"2026-11-10T22:36:11Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C","level":"critical"}],"exploited_since":"2026-07-16","updated_at":"2026-11-11T00:24:48.910061Z"}],"ghsa":[{"id":"GHSA-q6cq-5qpf-q237","title":"Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker...","description":"Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.","status":"published","published":"2026-07-14T18:32:13Z","modified":"2026-07-16T18:31:26Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-502"],"updated_at":"2026-11-02T15:09:33.90316Z"}],"kev":[{"id":"CVE-2026-58644","title":"Microsoft SharePoint Deserialization of Untrusted Data Vulnerability","description":"Microsoft SharePoint contains a deserialization of untrusted data vulnerability that allows an unauthorized attacker to execute code over a network.","cwes":["CWE-502"],"kev":{"date_added":"2026-07-16","due_date":"2026-07-19","required_action":"Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.","known_ransomware_use":"Unknown"},"updated_at":"2026-11-02T17:00:15.999436Z"}],"nvd":[{"id":"CVE-2026-58644","description":"Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.","status":"published","published":"2026-07-14T17:17:14.257Z","modified":"2026-07-17T05:16:40.47Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"secondary"}],"cwes":["CWE-502"],"updated_at":"2026-11-02T14:12:29.489525Z"}]}}